Abrasive wheel forming and dressing apparatus



March 1, 1960 H. E. BALslGER ABRASIVE WHEEL FORMING AND DRESSINGAPPARATUS Filed sept. 20, 1957 5 Sheets-Sheet 1 INVENTOR HRULD E.BALS/GER BY 7L TTORNEY Marhwl, 1960 H. E. BALslGER 2,926,651

ABRASIVE WHEEL FORMING AND DRESSING APPARATUS Filed Sept. 20, 1957 ssheets-sheet 2 INVENTOR HAROLD '.BALS/'@ BY/ 27M ATTORNEY March l, 1960H. E. BALSIGER 2,926,651

ABRASIVE WHEEL FORMING AND DRESSING APPARATUS Filed sept. 2o, 1957 5sheetsheet :s

INVENTOR HROLD E .BALS/GEZ BY l L TQRNEY United States Patent OApplicaties september zo', 1951, Serin No; 685295 9 claims. (ci.125;-11)

This invention relates lto dressing apparatus for abrasive wheels,particularly' wheels requiring rnded corn'ers, `(l-pending applicationSerial `No. 653,418, filed April 17, 1957, discloses apparatus fordressing the corners o'f the grinding wheel. It is therefore an objectof this invention td provide meansfor dressing the corners lof grindingwheel, the fase of thc grinding wheel, and means for actuating thedressing devices in predetermined timed relation, Another object is toprovidemeans for effecting radial adjustment of the corner dressing means. ,l Another object isto provide a novel method of dress-y ing agrinding wheel.` i .t Figure 1 is an end elevation partly cut away tovshow the relation between the corner dressing roller and the grindingwheel between the face dressing tool of the grinding wheel. Figre 2 isapartial ,sectional front elevation of the device for dressing thecorners of the grinding wheel.` Figure 3 is an end elevation to showmeans for effeetingradialadjustmentand of theV corner dresser. Figure 4is a hydraulic andelectric diagram.

Numeral indicates a rotatable grinding wheel.

is a fender and 12 isV a column for carrying the dressing devices.Within the'colurnn 12 is a member `13 slidably mounted for movementparallel to the axis ofthe grind-u ing wheel 10. A diamond holder lliis4suitably attached to member 13, A diamond dressing tool' 1 5`isfrnounted in diamond holder 14. Conventional means (not shown) areprovided for adjusting the diamond in a direction radially ofthegrinding wheel axis. Means for traversing the diamond dressing tool15 consists of a piston 31' in cylinderfl.

At the front oncolu'tnn 12, a b`racket20 is pivotally mounted at 2L Thelower part of braeket'-` 20 has a deve tail slide 22 in which isslidably mounted a member 23. A shaft `Ziirlountcd in depending portions2 5 of member 23 has rotatably mounted thereon a dressing roller 26consisting of two corner dressing members 27 formed to dress a radius onthe cornersof grinding wheel 1l) and an intermediate` member forengaging the grinding wheel 10 and limiting themovement of thecornerdressing members 27 re'lativet t'he'corners of grinding wheel 10.Said roller 26 is held on sleeve 29 by means of nuts 35 having notches36 which serve to accommodate a wrench and also to act as impellers whena jet of air is directed against them for initiating the rotation ofsaid roller.

Shaft 24, on which said roller is mounted, has a head 54 at one end. Theother end of said shaft 24 is supported in sleeve 50. Said sleeve 50 andhead 54 are supported for radial adjustment in a cylindrical bore 51 ineach of said depending portions 25. Said bore 51 is larger than sleeve50, head 54, and shaft 24 so that the sleeve may be adjusted radially bymeans of adjusting screws 52 and 53 of which there are three for eachend of shaft 24.

The function of the roller 26 might be performed 2,926,6si Paa'tentedMar. l, 196 0 Z equally well by oscillating segments and reciprocatingblocks. Suchelements are mechanical equivalents of said roller. Whereverthe term rollei is used in the claims, these equivalent elements areincluded.

The `composition of said roller may be varied to ing clude diamond orcarbide impregnated surfaces. WhenV this type of roller is used, theroller and the grinding wheel rotate at different peripheral speedsinorder to effect the dressing operation. The roller may also be made ofsmooth o'rroughcarbides or equivalent materials. When a smooth carbideroller isused, the roller and the grinding wheel rotate at the saineperipheral speed", and

the dressing operation is performed by a crushing action.

Operation When the wheelbasev (not shown) is in the `baci( position;,limit switch LS157 is closed. The purpose of this switch is to preventoperation of the dressing mechanism when the wheelbase is in the forwardposition. t LS157 connects the dressing circuit with a source of currentto start the dressing operation.

The start switch is closed. This switch has two con'-4 tacts.

Contact 1 of the start switch completes a ci`r`cuiti-i through normallyclosed ISCR'lto energize 14Cl. 14CR3and 1 4CR4 close toenergize valve.solenoid` 1115 to direct fluid under pressure to the head` en d yofdiamond traverse cylinder 30 to move piston 31 to the.

lento `mail: the first pass interesting tool l15 andante face` of thegrinding wheel 10. 14CR1 by-passes contact 1 of the start switchthrough' normally closed 15CR1 to' hold ,14CR- f a e;

Contact 2V ofthe start switch completes a circui `ttiA energize lTR.1TR1 completes a circuit from normally closed ZTRI to by-pass contact 2of `the `start switch ltof, hold lTR. 1TR2 completes a'circuit throughnormally v closed 16CR4 to energize air valve solenoid 1 08 The valveis.shifted to direct air against the notched nuts` .35 at oneor both endsof the radius dressing roller. ,Forl a` diamond dressing operation, thesurface speedvof the grinding wheel and Athe dressing tool should bedifferent.` For aerush dressingoperatiom the surface speeds of` grindingwheel and the crushing` toolshould be the sain" f In acnish dressingoperatiomthis initial .rotation avoidsV the grinding action onthecrusher which would o` c:ci i r i f the crusherhad to be started fromstandstill and brought up to crushing speedby contact of the grindingwheel rotating at grinding speed; l,

At the` end of therst pass of the dresser-LS'ISS is; closed` to completea circuit to energize 15CR. I tjalso'` completes a circui'tto energizeaco/unter which may,

1SCR2 completes a circuit` fion-i to`y MCR and 2TR. 16CR3 proyidesahelding circuit freni, lTRZ to 16CR and `ZTR"- Normally closed A16QR4`Opens; to. deenergize irvali/ e `solenoid 103 ,and `cnt olfuthe nowOrndriving th radius" dresser; Ataris time, the pripheral speed of theroller is less than that of the grinding wheel if a diamond impregnatedroller is used. If a crushing roller is used, its peripheral speed atthis time is substantially the same as that of the grinding wheel. Acrushing operation on a grinding Wheel, rotating at grinding speed, isperformed in a few seconds and only light pressure is exerted on thecrushing roller. Conventional crush dressing with the grindingl wheelrotating slowly and the crushing roller operating under high pressure,requires several minutes to complete the dressing operation.

16CR1 and 16CR2 energize radius dresser valve solenoid 107, shifting thevalve to the left and directing uid under pressure to the head end ofradius dresser cylinder 40. Piston 41 in said cylinder 40 moves theradius dresser roller into engagement with the grinding wheel to dressthe corners ofA said wheel.

; 2TR1 opens after a predetermined interval to deenergize and reset1TR1. 1TR2 opens and deenergizes 16CR and ZTR.

Deenergizing 16CR opens 16CR1 and 16CR2 to deenergize valve solenoid 107which is shifted to retract the radius dressing roller from the grindingwheel 10. ZTR is reset. At the same time that the radius dressing rollerwas moved into engagement with grinding wheel 10, normally closed CR1opened to 'deenergize 14CR.

14CR3 and 14CR4 open to deenergize valve solenoid said grinding wheel,4a dressing tool for dressing the straight portion of said grindingwheel, means for travers ing said dressing toolacross said grindingwheel, control means for initiating said movement of said roller andsaidv traverse movement of said dressing tool, and means including atiming device for withdrawing said roller before said dressing toolengages said grinding wheel.

2. Means for dressing a grinding wheel having a formed portion and astraight portion comprising a roller for dressing said'formedportion,means for moving said roller into and out of operative engagement withsaid grinding wheel, a dressing tool for dressing the straight portionof said grinding wheel, means for traversing said dressing tool acrosssaid grinding wheel, and control means for initiating said movement ofsaid roller and said traverse movement of said dressing tool inpredetermined timed relation.

3. Means for dressing a grinding wheel having a formed portion and astraight portion comprising a formed roller for dressing said formerportion, means for moving said roller into and out of operativeengagement with .said grinding wheel, a dressing tool for dressing thestraight portion of said grinding wheel, means for traversing saiddressing tool across said grinding wheel, and control means operable bysaid traverse means for initiating operation of said roller movingmeans.

Y; 4. Means for dressing a grinding wheel having a formed portion and astraight portion comprising a formed rollerl for dressing said formedportion, means for moving said roller into and out of operativeengagement with said grinding wheel, a dressing tool for dressing theface of said lgrinding wheel, means for traversing said dressing toolacross said grinding wheel, control means for initiating operation ofsaid traversing means, and means operable in response to said traversingmovement of said dressing tool to actuate said roller into and out ofoperative engagement with said grinding Wheel.

" 5. Means for dressing a grinding wheel having a formed portion whilesaid grinding wheel is rotating at grinding speed and a straight portioncomprising a formed roller for dressing said formed portion, a dressingtool for dressing the face of said grinding wheel, and means includingcontrol devices responsive to movement of said respective dressing meansrelative to said grinding wheel for subjecting said grinding wheelalternately to said roller and said dressing tool.

6. Means for dressing a grinding wheel having a formed portion and astraight portion comprising a formed dressing member for dressing saidformed portion, means for moving said member into and out of operativeengagement with said grinding wheel, a dressing tool for dressing theface of said grinding wheel, means for traversing said dressing toolacross said grinding wheel, and means for actuating said forming meansin response to the traversing of said dressing means.

7. In a grinding machine, a grinding wheel support, a grinding wheelrotatably mounted thereon, means for dressing the face and corners ofsaid grinding wheel including a dressing tool and means for moving sameacross the face of said grinding wheel, a corner dressing tool and meansfor moving same into and out of engagement with said corners, and meansresponsive to movement of said corners, means operable when saidgrinding wheel is inin-operative position -for initiating movement ofsaid dressing vtool across the `face of said grinding wheel, meansoperable at the end of said movement to initiate said movement in theopposite direction and also to effect movement of said corner formingtool to form said wheel corners,-and means operable after apredetermined intervalk to retract said corner forming tool.

9. Means for dressing a grinding wheel having a formed portion,comprising a roller for crush dressing said formed portion, means onsaid roller responsive to a stream of uid under pressure for effectingrotation of said roller at a surface speed substantially the same asthat of said grinding wheel, means` operable thereafter for moving saidroller into operative engagement with said grinding wheel, said meansbeing effective also for cutting off the supply of uid under pressure sothatsaid roller is driven only by said grinding wheel, and meansoperable after a predetermined interval for separating said roller andsaid grinding wheel.

References Cited in the tile of this patent vUNITED STATES PATENTS

